Can somebody explain the difference in animation stuff in server and local with looped thing?

Ummmmm so a general question, I have animation that works, in the way that other people can see the idle animation, not just player. This works though through this script, which does the animation manually each time it finishes.

tool.Equipped:Connect(function()
	idleAnimRunning = true
	if idleAnimRunning == true then
		repeat
			weaponIdleAnimTrack:Play()
			repeat
				wait()
			until weaponIdleAnimTrack.IsPlaying == false
			wait()
		until idleAnimRunning == false
	end
end)

However, it seems that the option that makes it much simpler, the loop option,

tool.Equipped:Connect(function()
	idleAnimRunning = true
	if idleAnimRunning == true then
		weaponIdleAnimTrack.Looped = true
		weaponIdleAnimTrack:Play()
		
	end
end)

does not seem to show another player the idle animation (it does show locally), EXCEPT when it is equipped, and the animation is manually put on, but after going through once it is no longer shown to server. The first option does work, but all I want to know is why this happens, and if this is a bug or if this is meant to happen. It just makes things a bit harder. I only want to know WHY this is like it is, so thanks in advance. I hate not knowing or understanding things...